Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Exercised	(95,000)
Weighted Average Exercise Price of Options Outstanding, Granted	$ 5.56
Class A [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	622,350	622,350
Common Stock Options Outstanding, No activity
Common Stock Options Outstanding, Granted	90,000
Common Stock Options Outstanding, Exercised	(136,000)
Common Stock Options Outstanding, Expired	(20,000)
Common Stock Options Outstanding, Ending balance	556,350	622,350
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 5.65	$ 5.65
Weighted Average Exercise Price of Options Outstanding, No activity
Weighted Average Exercise Price of Options Outstanding, Granted	$ 5.56
Weighted Average Exercise Price of Options Outstanding, Exercised	$ 4.68
Weighted Average Exercise Price of Options Outstanding, Expired	$ 3.75
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 6.24	$ 5.65
Common Stock Exercisable Options, Outstanding Beginning balance	544,383	449,750
Common Stock Exercisable Options, Outstanding Ending balance	506,350	544,383
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 5.86	$ 6.22
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 6.26	$ 5.86
Class B [Member]
Equity And Stock-Based Compensation [Line Items]
Common Stock Options Outstanding, Beginning balance	185,100	185,100
Common Stock Options Outstanding, No activity
Common Stock Options Outstanding, Granted
Common Stock Options Outstanding, Exercised
Common Stock Options Outstanding, Expired
Common Stock Options Outstanding, Ending balance	185,100	185,100
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 9.90	$ 9.90
Weighted Average Exercise Price of Options Outstanding, No activity
Weighted Average Exercise Price of Options Outstanding, Granted
Weighted Average Exercise Price of Options Outstanding, Exercised
Weighted Average Exercise Price of Options Outstanding, Expired
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 9.90	$ 9.90
Common Stock Exercisable Options, Outstanding Beginning balance	167,550	150,000
Common Stock Exercisable Options, Outstanding Ending balance	185,100	167,550
Weighted Average Price of Exercisable Options, Outstanding Beginning balance	$ 10.05	$ 10.24
Weighted Average Price of Exercisable Options, Outstanding Ending balance	$ 9.90	$ 10.05